Finding the Fourth Proportional to 2,011.68, 3,015.72 and 971.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.68 : 3,015.72 = 971.10 : x
2. Step 2: Convert to fraction form
   2,011.68/3,015.72 = 971.10/x
3. Step 3: Cross multiply
   2,011.68x = 3,015.72 × 971.10
4. Step 4: Simplify right side
   2,011.68x = 2,928,565.69
5. Step 5: Solve for x
   x = 2,928,565.69/2,011.68
6. Step 6: Final answer
   x = 1,455.78